<title>看球的巴士</title><link href="http://hzoi.com/tomorrow.css" rel="stylesheet"><div class="ui existing segment"><pre><code><span class="pl-cp">#include</span> <span class="pl-cpf">&lt;algorithm&gt;</span><span class="pl-cp"></span>
<span class="pl-cp">#include</span> <span class="pl-cpf">&lt;cstring&gt;</span><span class="pl-cp"></span>
<span class="pl-cp">#include</span> <span class="pl-cpf">&lt;iostream&gt;</span><span class="pl-cp"></span>
<span class="pl-k">using</span> <span class="pl-k">namespace</span> <span class="pl-n">std</span><span class="pl-p">;</span>
<span class="pl-kt">char</span> <span class="pl-n">a</span><span class="pl-p">[</span><span class="pl-mi">3000</span><span class="pl-p">];</span>
<span class="pl-kt">int</span> <span class="pl-n">n</span><span class="pl-p">,</span> <span class="pl-n">d</span><span class="pl-p">,</span> <span class="pl-n">dp</span><span class="pl-p">[</span><span class="pl-mi">3000</span><span class="pl-p">],</span> <span class="pl-n">hi</span><span class="pl-p">,</span> <span class="pl-n">ji</span><span class="pl-p">;</span>
<span class="pl-kt">int</span> <span class="pl-nf">main</span><span class="pl-p">()</span> <span class="pl-p">{</span>
    <span class="pl-n">cin</span> <span class="pl-o">&gt;&gt;</span> <span class="pl-n">n</span> <span class="pl-o">&gt;&gt;</span> <span class="pl-n">d</span><span class="pl-p">;</span>
    <span class="pl-n">memset</span><span class="pl-p">(</span><span class="pl-n">dp</span><span class="pl-p">,</span> <span class="pl-mh">0x3f</span><span class="pl-p">,</span> <span class="pl-k">sizeof</span><span class="pl-p">(</span><span class="pl-n">dp</span><span class="pl-p">));</span>
    <span class="pl-n">dp</span><span class="pl-p">[</span><span class="pl-mi">0</span><span class="pl-p">]</span> <span class="pl-o">=</span> <span class="pl-mi">0</span><span class="pl-p">;</span>
    <span class="pl-k">for</span> <span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">i</span> <span class="pl-o">=</span> <span class="pl-mi">1</span><span class="pl-p">;</span> <span class="pl-n">i</span> <span class="pl-o">&lt;=</span> <span class="pl-n">n</span><span class="pl-p">;</span> <span class="pl-n">i</span><span class="pl-o">++</span><span class="pl-p">)</span> <span class="pl-p">{</span>
        <span class="pl-n">cin</span> <span class="pl-o">&gt;&gt;</span> <span class="pl-n">a</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">];</span>
        <span class="pl-k">for</span> <span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">j</span> <span class="pl-o">=</span> <span class="pl-n">i</span><span class="pl-p">;</span> <span class="pl-n">j</span> <span class="pl-o">&gt;=</span> <span class="pl-mi">1</span><span class="pl-p">;</span> <span class="pl-n">j</span><span class="pl-o">--</span><span class="pl-p">)</span> <span class="pl-p">{</span>
            <span class="pl-k">if</span> <span class="pl-p">(</span><span class="pl-n">a</span><span class="pl-p">[</span><span class="pl-n">j</span><span class="pl-p">]</span> <span class="pl-o">==</span> <span class="pl-sc">&#39;H&#39;</span><span class="pl-p">)</span> <span class="pl-n">hi</span><span class="pl-o">++</span><span class="pl-p">;</span>
            <span class="pl-k">if</span> <span class="pl-p">(</span><span class="pl-n">a</span><span class="pl-p">[</span><span class="pl-n">j</span><span class="pl-p">]</span> <span class="pl-o">==</span> <span class="pl-sc">&#39;J&#39;</span><span class="pl-p">)</span> <span class="pl-n">ji</span><span class="pl-o">++</span><span class="pl-p">;</span>
            <span class="pl-k">if</span> <span class="pl-p">(</span><span class="pl-n">hi</span> <span class="pl-o">==</span> <span class="pl-mi">0</span> <span class="pl-o">||</span> <span class="pl-n">ji</span> <span class="pl-o">==</span> <span class="pl-mi">0</span> <span class="pl-o">||</span> <span class="pl-n">abs</span><span class="pl-p">(</span><span class="pl-n">hi</span> <span class="pl-o">-</span> <span class="pl-n">ji</span><span class="pl-p">)</span> <span class="pl-o">&lt;=</span> <span class="pl-n">d</span><span class="pl-p">)</span> <span class="pl-p">{</span>
                <span class="pl-n">dp</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">]</span> <span class="pl-o">=</span> <span class="pl-n">min</span><span class="pl-p">(</span><span class="pl-n">dp</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">],</span> <span class="pl-n">dp</span><span class="pl-p">[</span><span class="pl-n">j</span> <span class="pl-o">-</span> <span class="pl-mi">1</span><span class="pl-p">]</span> <span class="pl-o">+</span> <span class="pl-mi">1</span><span class="pl-p">);</span>
            <span class="pl-p">}</span>
        <span class="pl-p">}</span>
        <span class="pl-n">hi</span> <span class="pl-o">=</span> <span class="pl-mi">0</span><span class="pl-p">;</span>
        <span class="pl-n">ji</span> <span class="pl-o">=</span> <span class="pl-mi">0</span><span class="pl-p">;</span>
    <span class="pl-p">}</span>
    <span class="pl-n">cout</span> <span class="pl-o">&lt;&lt;</span> <span class="pl-n">dp</span><span class="pl-p">[</span><span class="pl-n">n</span><span class="pl-p">];</span>
    <span class="pl-k">return</span> <span class="pl-mi">0</span><span class="pl-p">;</span>
<span class="pl-p">}</span>
</cpde></pre></div>